神奈川縣横濱・逗子・片瀬地方の新生代有孔蟲群の研究

概要

論文の詳細を見る
This paper deals with the Pleistocene and Pliocene formations of the northern part of Miura Peninsula., We have selected at first 3 standard cross section lines, along which the stratigraphical relations are observable clearly., These are as follows: I) Totsuka-Enoshima line, II) Hino-Kamakura line, III) Tomioka-Zushi line., In the vicinity of Yokohama, 4 section lines closely located are added mainly for the purpose of tracing there the supposed anticlinolium., The formations of this area are divided into two groups, the upper, the upper the Narita and the lower the Miura., Here we refer to the Miura group only., The foraminiferal fauna of the Miura group is divided into the following 8-10 faunal units in the are surveryed., I., (Totsuka-Enoshima line): 1) Nodosaria-Nodogenerina, 2) Cibicides, 3) Elphidium-Cibicides, 4) Bulimina-Cassidulina, 5) Bulimina-Rotalia, 6) Cassidulina, 7) Pseudononion-Lagenonodosaria, 8) Pseudononion., II., (Hino-Kamakura lilne): 1) Nodosaria-Nodogenerina, 2) Cibicides-Uvigerina, 3) Elphidium-Cibicides, 4) Cibicides-Bulimina, 5) Bulimina, 6) Cassidulilna, 7) Elphidium-Cibicides, 8) Rotalia-Lagenonodosaria, 9) Pseudononion., III., (Tomioka-Zushi line): 1) Nodosaria-Nodogenerina, 2) Cassidulina-Cibicides, 3) Elphidium-Cassidulina, 4) Elphidium-Cibicides, 5) Cassidulina-Bulimina, 6) Cassidulilna-Rotalia, 7) Elphidium-Cibicides, 8) Elphidium-Planulina, 9) Pseudononion-Lagenonodosaria, 10) Pseudononion., IV., (Tomioka-Horinouchi line): 1) Bulimina, 2) Cassidulina, 3) Pseudononion., V., (Nakazato-Nishitobe line): 1) Rotalia, 2) Bulimina, 3) Pseudononion., VI., (Western side of the Yokohama Station): 1) Bulimina., VII., (Shimokashio-Kamihoshikawa line): 1) Rotalia, 2) Bulimina, 3) Pseudononion., From these faunal units we distinguished the following 6 faunal groups: 1) Nodosaria-Nodogenerina group which represents the Zushi member of the Kamakura formation 2) Cibicides-Cassidulilna-Uvigerina group which represents the Ikego member of the Kanazawa formation., 3) Elphidium-Cassidulina-Cibicides group which represents The Nojima member of the Kanazawa formation., 4) Gassidulina-Bulimina-Rotalia group which represents the Ofuna member of the Sugita formation., 5) Cassidulina-Eiphidium-Planulina group which represents the Koshiba member of the Sugita formation and the lower Nakazato member of the Sugita formation in the vicinity of Yokohama., 6) Pseudononion group which represents the typical Nakazato member of the Sugita formation., The Koshiba member has a very variable rock facies in its distribution, losing gradually its characteristics towards Ofuna, and being hardly distinguished from the Nakazato member in the vicinity of Yokohama., Elphidium-Planulina group, the typical Koshiba fauna, has changed into Cassidulina group corresponding to the variation of the rock facies., Cassidulina-Elphidium-Planulina group means both of the Cassidulina group and the Elphidium-Planulilna group, of which the former distributes widely in the are, while the latter only locally., Then the presence of an anticlinolium is ascertained in the vicinity of Yokohama, instead of the monoclinal structure as hitherto been considered.,
日本地質学会の論文
1951-02-28

神奈川縣横濱・逗子・片瀬地方の新生代有孔蟲群の研究

スポンサーリンク

概要

著者

関連論文

スポンサーリンク